Tennessee Code Title 40. Criminal Procedure § 40-12-217

(b)(1) Upon the filing of the notice required by subsection (a), the functions of the grand jury shall cease and it shall be considered dissolved.

(2) In no event, except as provided in this section, shall a grand jury convened pursuant to this part remain impaneled for a period of time to exceed six (6) months from the day it is sworn.

(c)(1) Should a period of time exceeding six (6) months be necessary for the grand jury to complete its work, the district attorney general may file an application with the committee described in § 40-12-201 requesting permission to petition the empanelling judge for an extension of the grand jury for a period of time not to exceed six (6) months from the date the petition is granted.

(2) The application shall specify why additional time is necessary for the completion of the investigation.

(3) If the committee unanimously agrees that an extension of time is necessary, it shall grant written consent to petition the empanelling judge for an extension of the grand jury for the period requested.

(4) This written consent shall accompany the petition to the empanelling judge who shall grant the petition if the judge finds an extension of time to be necessary for the grand jury to complete its investigation.

(5) No more than two (2) six-month extensions may be obtained pursuant to this section.